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This removes flicker in Omnibox that briefly exposes the internal URL
when restoring session history. Virtual URL must be set on the pending
item before calling |loadCurrentURLInWebView| because
WebStateObserver::DidStartLoading event fires during this call, which
triggers ToolbarModelDelegateIOS to update itself using the virtual
URL of the pending item.

Bug: 815248
Cq-Include-Trybots: master.tryserver.chromium.mac:ios-simulator-cronet;master.tryserver.chromium.mac:ios-simulator-full-configs
Change-Id: I260e251d90ad832120b908a61843fe30df261be3
Reviewed-on: https://chromium-review.googlesource.com/1003252
Commit-Queue: Danyao Wang <danyao@chromium.org>
Reviewed-by: Eugene But <eugenebut@chromium.org>
Cr-Commit-Position: refs/heads/master@{#550184}